Q23 of 60 Page 140

Which of the following set of elements is written in order of their increasing metallic character?

Down the group metallic character increases and across the period metallic character decreases. Only option (a) follows the right order.

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21

An element which is an essential constituent of all organic compounds belongs to:

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Which of the following is the outermost shell for elements of period 2?

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In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?

 1

Write true or false for the following statements:

It was assumed by Newlands that only 63 elements existed in nature and no more elements would be discovered in the future.